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  • 1
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. TheP IO2 at which crabs emerged from shallow seawater during progressive hypoxia (Table 1), as well as theP c levels for $$\dot V_{O_2 }$$ (Fig. 2) and $$\dot V_g $$ (Fig. 4) of submerged crabs, increased with acclimation temperature and following exposure to 50% seawater at low temperatures (Fig. 6). This pattern of variation resembles the changes in relative oxygen demand with temperature and salinity. 2. TheP c levels for heart rate increased with acclimation temperature but were unaffected by dilution (Fig. 6). 3. Percentage extraction of oxygen from the respired water (Table 2) as well as the levels of motor activity (Fig. 5) were not affected by exposure to hypoxia. 4. Lactic acid concentration in the blood of submerged crabs increased markedly during hypoxia and there was an enhanced $$\dot V_{O_2 }$$ on recovery in normoxia (Fig. 2), which apparently served to completely repay an accumulated oxygen debt. 5. It was concluded that when exposed to environmental hypoxiaCarcinus can adopt the alternative strategies of either accumulating an oxygen debt when in deep water or emerging into air from shallow water to aerate the branchial chambers.
    Type of Medium: Electronic Resource
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